﻿/*
 * autoCombo v1.0
 * Copyright (c) 2010 congenlv@gmail.com
 * note:
 *	动态显示下拉例表,
 *	如果不使用缓存则每次都重新加载数据
 *	本地数据不使用缓存
 *	远程数据如果设置缓存大小大于1则使用缓存,如果缓存不存在时重新查询,(传入q:输入字段,limit:获取记录数)并将结果添加进缓存中.
 *	使用表格例表可设置是否使用分页.
 * Depends:
 * 	jquery.autoComplete.js
 * 	jquery.flexigrid.js 如果使用表格
 */
;(function($) {
	$.fn.extend({
		autocompleteCombo: function(urlOrData, options) {
			var isUrl = typeof urlOrData == "string";
			options = $.extend({}, $.Autocompleter.defaults, {
				url: isUrl ? urlOrData : null,
				data: isUrl ? null : urlOrData,
				delay: isUrl ? $.Autocompleter.defaults.delay : 10,
				max: options && !options.scroll ? 10 : 150
			}, options);
			
			// if highlight is set to false, replace it with a do-nothing function
			options.highlight = options.highlight || function(value) { return value; };
			
			// if the formatMatch option is not specified, then use formatItem for backwards compatibility
			options.formatMatch = options.formatMatch || options.formatItem;
			return this.each(function() {
				new $.Autocompleter(this, options);
			});
		},
		result: function(handler) {
			return this.bind("result", handler);
		},
		search: function(handler) {
			return this.trigger("search", [handler]);
		},
		flushCache: function() {
			return this.trigger("flushCache");
		},
		setOptions: function(options){
			return this.trigger("setOptions", [options]);
		},
		unautocomplete: function() {
			return this.trigger("unautocomplete");
		}
	});

	$.Autocompleter = function(input, options) {

		var KEY = {
			UP: 38,
			DOWN: 40,
			DEL: 46,
			TAB: 9,
			RETURN: 13,
			ESC: 27,
			COMMA: 188,
			PAGEUP: 33,
			PAGEDOWN: 34,
			BACKSPACE: 8
		};

		// Create $ object for input element
		var $input = $(input).attr("autocomplete", "off").addClass(options.inputClass);

		var timeout;
		var previousValue = "";
		var cache = $.Autocompleter.Cache(options);
		var hasFocus = 0;
		var lastKeyPressCode;
		var config = {
			mouseDownOnSelect: false,
			total:-1,
			page:1
		};
		var select = $.Autocompleter.Select(options, input, selectCurrent, config);
		
		var blockSubmit;
		
		// prevent form submit in opera when selecting with return key
		$.browser.opera && $(input.form).bind("submit.autocomplete", function() {
			if (blockSubmit) {
				blockSubmit = false;
				return false;
			}
		});
		
		// only opera doesn't trigger keydown multiple times while pressed, others don't work with keypress at all
		$input.bind(($.browser.opera ? "keypress" : "keydown") + ".autocomplete", function(event) {
			// a keypress means the input has focus
			// avoids issue where input had focus before the autocomplete was applied
			hasFocus = 1;
			// track last key pressed
			lastKeyPressCode = event.keyCode;
			switch(event.keyCode) {
			
				case KEY.UP:
					event.preventDefault();
					if ( select.visible() ) {
						select.prev();
					} else {
						onChange(0, true);
					}
					break;
					
				case KEY.DOWN:
					event.preventDefault();
					if ( select.visible() ) {
						select.next();
					} else {
						onChange(0, true);
					}
					break;
					
				case KEY.PAGEUP:
					event.preventDefault();
					if ( select.visible() ) {
						select.pageUp();
					} else {
						onChange(0, true);
					}
					break;
					
				case KEY.PAGEDOWN:
					event.preventDefault();
					if ( select.visible() ) {
						select.pageDown();
					} else {
						onChange(0, true);
					}
					break;
				
				// matches also semicolon
				case options.multiple && $.trim(options.multipleSeparator) == "," && KEY.COMMA:
				case KEY.TAB:
				case KEY.RETURN:
					if( selectCurrent() ) {
						// stop default to prevent a form submit, Opera needs special handling
						event.preventDefault();
						blockSubmit = true;
						return false;
					}
					break;
					
				case KEY.ESC:
					select.hide();
					break;
					
				default:
					clearTimeout(timeout);
					timeout = setTimeout(onChange, options.delay);
					break;
			}
		}).focus(function(){
			// track whether the field has focus, we shouldn't process any
			// results if the field no longer has focus
			hasFocus++;
		}).blur(function() {
			hasFocus = 0;
			if (!config.mouseDownOnSelect) {
				hideResults();
			}
		}).click(function() {
			// show select when clicking in a focused field
			if ( hasFocus++ > 1 && !select.visible() ) {
				onChange(0, true);
			}
		}).bind("search", function() {
			// TODO why not just specifying both arguments?
			var fn = (arguments.length > 1) ? arguments[1] : null;
			function findValueCallback(q, data) {
				var result;
				if( data && data.length ) {
					for (var i=0; i < data.length; i++) {
						if( data[i].result.toLowerCase() == q.toLowerCase() ) {
							result = data[i];
							break;
						}
					}
				}
				if( typeof fn == "function" ) fn(result);
				else $input.trigger("result", result && [result.data, result.value]);
			}
			$.each(trimWords($input.val()), function(i, value) {
				request(value, findValueCallback, findValueCallback);
			});
		}).bind("flushCache", function() {
			cache.flush();
		}).bind("setOptions", function() {
			$.extend(options, arguments[1]);
			// if we've updated the data, repopulate
			if ( "data" in arguments[1] )
				cache.populate();
		}).bind("unautocomplete", function() {
			select.unbind();
			$input.unbind();
			$(input.form).unbind(".autocomplete");
		});
		
		
		function selectCurrent() {
			var selected = select.selected();
			if( !selected )
				return false;
			
			var v = selected.result;
			previousValue = v;
			
			if ( options.multiple ) {
				var words = trimWords($input.val());
				if ( words.length > 1 ) {
					var seperator = options.multipleSeparator.length;
					var cursorAt = $(input).selection().start;
					var wordAt, progress = 0;
					$.each(words, function(i, word) {
						progress += word.length;
						if (cursorAt <= progress) {
							wordAt = i;
							return false;
						}
						progress += seperator;
					});
					words[wordAt] = v;
					// TODO this should set the cursor to the right position, but it gets overriden somewhere
					//$.Autocompleter.Selection(input, progress + seperator, progress + seperator);
					v = words.join( options.multipleSeparator );
				}
				v += options.multipleSeparator;
			}
			
			$input.val(v);
			hideResultsNow();
			$input.trigger("result", [selected.data, selected.value]);
			return true;
		}
		
		function onChange(crap, skipPrevCheck) {
			if( lastKeyPressCode == KEY.DEL ) {
				select.hide();
				return;
			}
			
			var currentValue = $input.val();
			
			if ( !skipPrevCheck && currentValue == previousValue )
				return;
			
			previousValue = currentValue;
			
			currentValue = lastWord(currentValue);
			if ( currentValue.length >= options.minChars) {
				$input.addClass(options.loadingClass);
				if (!options.matchCase)
					currentValue = currentValue.toLowerCase();
				request(currentValue, receiveData, hideResultsNow);
			} else {
				stopLoading();
				select.hide();
			}
		};
		
		function trimWords(value) {
			if (!value)
				return [""];
			if (!options.multiple)
				return [$.trim(value)];
			return $.map(value.split(options.multipleSeparator), function(word) {
				return $.trim(value).length ? $.trim(word) : null;
			});
		}
		
		function lastWord(value) {
			if ( !options.multiple )
				return value;
			var words = trimWords(value);
			if (words.length == 1) 
				return words[0];
			var cursorAt = $(input).selection().start;
			if (cursorAt == value.length) {
				words = trimWords(value);
			} else {
				words = trimWords(value.replace(value.substring(cursorAt), ""));
			}
			return words[words.length - 1];
		}
		
		// fills in the input box w/the first match (assumed to be the best match)
		// q: the term entered
		// sValue: the first matching result
		function autoFill(q, sValue){
			// autofill in the complete box w/the first match as long as the user hasn't entered in more data
			// if the last user key pressed was backspace, don't autofill
			if( options.autoFill && (lastWord($input.val()).toLowerCase() == q.toLowerCase()) && lastKeyPressCode != KEY.BACKSPACE ) {
				// fill in the value (keep the case the user has typed)
				$input.val($input.val() + sValue.substring(lastWord(previousValue).length));
				// select the portion of the value not typed by the user (so the next character will erase)
				$(input).selection(previousValue.length, previousValue.length + sValue.length);
			}
		};

		function hideResults() {
			clearTimeout(timeout);
			timeout = setTimeout(hideResultsNow, 200);
		};

		function hideResultsNow() {
			var isVisible = select.visible();
			if(isVisible)
				select.hide();
			clearTimeout(timeout);
			stopLoading();
			if (options.mustMatch) {
				// call search and run callback
				$input.search(
					function (result){
						// if no value found, clear the input box
						if( !result ) {
							if (options.multiple) {
								var words = trimWords($input.val()).slice(0, -1);
								$input.val( words.join(options.multipleSeparator) + (words.length ? options.multipleSeparator : "") );
							}
							else {
								$input.val( "" );
								$input.trigger("result", null);
							}
						}
					}
				);
			}
		};

		function receiveData(q, data) {
			if(options.url&&options.component.gridSetting.usepager){
				stopLoading();
				select.display(data, q);
				select.show();
				return;
			}
			if ( data && data.length) {
				stopLoading();
				select.display(data, q);
				autoFill(q, data[0].value);
				select.show();
			} else {
				hideResultsNow();
			}
		};

		function request(term, success, failure) {
			if (!options.matchCase)
				term = term.toLowerCase();
			var data = cache.load(term);
			// recieve the cached data
			if (data) {
				success(term, data);
				if(options.component.type=='grid'&&options.component.gridSetting.usepager){
					var params = [{ name:input.name, value: term}];
					select.gridSettingOptions({extParam:params});
				}
			// if an AJAX url has been supplied, try loading the data now
			} else if( (typeof options.url == "string") && (options.url.length > 0) ){
				//for ajax request first init
				select.init();
				select.show();
				if(options.component.type=='grid'&&options.component.gridSetting.usepager){//process grid
					var params = [{ name:  input.name, value: term}];
					select.reloadGrid({extParam:params,newp:1},function(result){
						if(result&&result.success){
							var parsed=options.parse&&options.parse(result)||parse(result,term);
							if(result.page=='1')
								cache.add(term, parsed);
							success(term, parsed);
						}else{
							select.emptyList();
							config.total=-1;
						}
					});
				}else{//process default
					var params = [
					              { name: 'page.pageNo', value: config.page }
					              ,{ name: 'page.pageSize', value: options.max }
					              ,{ name:  input.name, value: term}
					              ];
					$.ajax({
						// try to leverage ajaxQueue plugin to abort previous requests
						mode: "abort",
						// limit abortion to this input
						port: "autocomplete" + input.name,
						dataType: options.dataType,
						url: options.url,
						data:params ,
						success: function(result) {
							if(result&&result.success){
								var parsed=options.parse&&options.parse(result,term)||parse(result);
								cache.add(term, parsed);
								success(term, parsed);
							}else{
								select.emptyList();
								//failure(term);
							}
					}
					});
				}
			} else {
				// if we have a failure, we need to empty the list -- this prevents the the [TAB] key from selecting the last successful match
				select.emptyList();
				failure(term);
			}
		};
		
		function parse(result,term) {
			var parsed = [];
			var rows=result.rows;
			for (var i=0,len=rows.length; i < len; i++) {
				var row = rows[i];
				var value=options.formatMatch(row, i+1, len);
				var formateResult=options.formatResult && options.formatResult(row,value);
				parsed[parsed.length] = {data: row,value:value,result: formateResult};
			}
			if(options.url&&options.component.gridSetting.usepager){
				return {total:result.total,page:result.page,rows:parsed,term:term};
			}
			return parsed;
		};
		
		function stopLoading() {
			$input.removeClass(options.loadingClass);
		};

	};

	$.Autocompleter.defaults = {
		inputClass: "ac_input",
		resultsClass: "ac_results",
		loadingClass: "ac_loading",
		minChars: 1,
		delay: 300,
		matchCase: false,
		matchSubset: true,
		matchContains: false,
		cacheLength: 10,
		max: 100,
		mustMatch: false,
		extraParams: {},
		selectFirst: true,
		formatItem: function(row) { return row;},
		formatMatch: null,
		autoFill: false,
		width: 0,
		dataType:'json',
		multiple: false,
		multipleSeparator: ", ",
		highlight: function(value, term) {
			return value.replace(new RegExp("(?![^&;]+;)(?!<[^<>]*)(" + term.replace(/([\^\$\(\)\[\]\{\}\*\.\+\?\|\\])/gi, "\\$1") + ")(?![^<>]*>)(?![^&;]+;)", "gi"), "<strong style='color:blue'>$1</strong>");
		},
	    scroll: true,
	    scrollHeight: 180,
	    component:{
			type:"ul",//options value :grid,treegrid,combobox
			gridSetting:{},
			treegridSetting:{},
			comboboxSetting:{}
		}
	};

	$.Autocompleter.Cache = function(options) {

		var data = {};
		var length = 0;
		
		function matchSubset(s, sub) {
			if (!options.matchCase) 
				s = s.toLowerCase();
			var i = s.indexOf(sub);
			if (options.matchContains == "word"){
				i = s.toLowerCase().search("\\b" + sub.toLowerCase());
			}
			if (i == -1) return false;
			return i == 0 || options.matchContains;
		};
		
		function add(q, value) {
			if (length > options.cacheLength){
				flush();
			}
			if (!data[q]){ 
				length++;
			}
			data[q] = value;
		}
		
		function populate(){
			if( !options.data ) return false;
			// track the matches
			var stMatchSets = {},
				nullData = 0;

			// no url was specified, we need to adjust the cache length to make sure it fits the local data store
			if( !options.url ) options.cacheLength = 1;
			
			// track all options for minChars = 0
			stMatchSets[""] = [];
			
			// loop through the array and create a lookup structure
			for ( var i = 0, ol = options.data.length; i < ol; i++ ) {
				var rawValue = options.data[i];
				// if rawValue is a string, make an array otherwise just reference the array
				rawValue = (typeof rawValue == "string") ? [rawValue] : rawValue;
				
				var value = options.formatMatch(rawValue, i+1, options.data.length);
				if ( value === false )
					continue;
					
				var firstChar = value.charAt(0).toLowerCase();
				// if no lookup array for this character exists, look it up now
				if( !stMatchSets[firstChar] ) 
					stMatchSets[firstChar] = [];

				// if the match is a string
				var row = {
					value: value,
					data: rawValue,
					result: options.formatResult && options.formatResult(rawValue) || value
				};
				
				// push the current match into the set list
				stMatchSets[firstChar].push(row);

				// keep track of minChars zero items
				if ( nullData++ < options.max ) {
					stMatchSets[""].push(row);
				}
			};

			// add the data items to the cache
			$.each(stMatchSets, function(i, value) {
				// increase the cache size
				options.cacheLength++;
				// add to the cache
				add(i, value);
			});
		}
		
		// populate any existing data
		//setTimeout(populate, 25);
		populate();
		
		function flush(){
			data = {};
			length = 0;
		}

		
		return {
			flush: flush,
			add: add,
			populate: populate,
			load: function(q) {
				if (!options.cacheLength || !length)
					return null;
				/* 
				 * if dealing w/local data and matchContains than we must make sure
				 * to loop through all the data collections looking for matches
				 */
				if( !options.url ){
					// track all matches
					var csub = [];
					// loop through all the data grids for matches
					for( var k in data ){
						// don't search through the stMatchSets[""] (minChars: 0) cache
						// this prevents duplicates
						if( k.length > 0 ){
							var c = data[k];
							$.each(c, function(i, x) {
								// if we've got a match, add it to the array
								if (matchSubset(x.value, q)) {
									csub.push(x);
								}
							});
						}
					}				
					return csub;
				} else 
				// if the exact item exists, use it
				if (data[q]){
					return data[q];
				} else
				if (options.matchSubset) {
					for (var i = q.length - 1; i >= options.minChars; i--) {
						var c = data[q.substr(0, i)];
						if (c) {
							var csub = [];
							$.each(c, function(i, x) {
								if (matchSubset(x.value, q)) {
									csub[csub.length] = x;
								}
							});
							return csub;
						}
					}
				}
				return null;
			}
		};
	};

	$.Autocompleter.Select = function (options, input, select, config) {
		var CLASSES = {
			ACTIVE: options.component.type=='grid'?"trOver":"ac_over"
		};
		
		var listItems,
			active = -1,
			data,
			term = "",
			needsInit = true,
			element,
			listId,
			list;
		
		// Create results
		function init() {
			if (!needsInit)
				return;
			element = $("<div/>").hide().addClass(options.resultsClass).css("position", "absolute").appendTo(document.body);
		    if(options.component.type=='grid'){//process grid
		    	listId=input.id+"ComboGridWrap";
				list=$("<div/>").attr('id',listId).appendTo(element);
				var gridSetting = $.extend({}, options.component.gridSetting, {url:options.url,rp:options.max,useRp:false,onRowClick:onRowClick,rowbinddata:false}, options);
				if(!gridSetting.url){
					$.extend(gridSetting,{onChangePage:onChangePage});
				}else{
					$.extend(gridSetting,{autoload:false});
				}
				list.flexigrid(gridSetting);
				element.mouseover(function(event) {
					active = $('tbody tr', list).index($('tbody tr.'+CLASSES.ACTIVE, list)[0]);
					config.mouseDownOnSelect = true;
				}).mouseout(function() {
					config.mouseDownOnSelect = false;
					$(input).focus();
				});
		    }else{//process ul for default
				list = $("<ul/>").appendTo(element).mouseover( function(event) {
					if(target(event).nodeName && target(event).nodeName.toUpperCase() == 'LI') {
			            active = $("li", list).removeClass(CLASSES.ACTIVE).index(target(event));
					    $(target(event)).addClass(CLASSES.ACTIVE);            
			        }
				}).click(function(event) {
					$(target(event)).addClass(CLASSES.ACTIVE);
					select();
					// TODO provide option to avoid setting focus again after selection? useful for cleanup-on-focus
					input.focus();
					return false;
				}).mousedown(function() {
					config.mouseDownOnSelect = true;
				}).mouseup(function() {
					config.mouseDownOnSelect = false;
				});
		    }
			
			if( options.width > 0 )
				element.css("width", options.width);
				
			needsInit = false;
		}
		function reloadGrid(options,onReloadResult){
			var options = $.extend({}, options, {onRequestSuccess:onReloadResult,onRequestError:onReloadResult});
			list.flexReload(options);
		}
		function onChangePage(newP){
			if(newP>=0){
				var total=data.length;
				var end = options.max;
				var start=0;
				if(newP&&newP>1){
					start = (newP - 1) *options.max;
					end = start + end;
					if (total < end)
						end = total;
				}
				var rows=[];
				for (var i=start; i < end; i++) {
					rows.push(data[i].data);
				}
				if(rows.length==0)
					return false;
				var gridData={page:newP,total:total,rows:rows};
				list.flexAddData(gridData);
				listItems=list[0].grid.getListItems();
			}
		}
		function onRowClick(event){
			$(event).addClass(CLASSES.ACTIVE);
			select();
			input.focus();
			return false;
		}
		function gridSettingOptions(options){
			list.flexOptions(options);
		}
		function target(event) {
			var element = event.target;
			while(element && element.tagName != "LI")
				element = element.parentNode;
			// more fun with IE, sometimes event.target is empty, just ignore it then
			if(!element)
				return [];
			return element;
		}
		function moveSelect(step) {
			listItems.slice(active, active + 1).removeClass(CLASSES.ACTIVE);
			movePosition(step);
	        var activeItem = listItems.slice(active, active + 1).addClass(CLASSES.ACTIVE);
	        if(options.scroll) {
	        	var wrapEle=list;
	            var offset = 0;
	            listItems.slice(0, active).each(function() {
					offset += this.offsetHeight;
				});
	            var scrollbarsVisible = offset > options.scrollHeight;
	            if((offset + activeItem[0].offsetHeight - wrapEle.scrollTop()) > wrapEle[0].clientHeight) {
	            	wrapEle.scrollTop(offset + activeItem[0].offsetHeight -wrapEle[0].clientHeight);
	            } else if(offset < wrapEle.scrollTop()) {
	            	wrapEle.scrollTop(offset);
	            }
	        }
		};
		
		function movePosition(step) {
			active += step;
			if (active < 0) {
				active = listItems.size() - 1;
			} else if (active >= listItems.size()) {
				active = 0;
			}
		}
		
		function limitNumberOfItems(available) {
			var max= options.max && options.max < available? options.max: available;
			return max==0?available:max;
		}
		function fillList() {
			list.empty();
			switch (options.component.type) {
			case 'grid':
				if(options.url&&options.component.gridSetting.usepager){
					if(!data)
						return;
					var rows=[];
					var parsed=data.rows;
					for (var i=0,len=parsed.length; i < len; i++) {
						rows.push(parsed[i].data);
					}
					var gridData={page:data.page,total:data.total,rows:rows};
					list.flexAddData(gridData);
					listItems=list[0].grid.getListItems();
					listItems.each(function(i,item){
						$.data(item, "ac_data", parsed[i]);
					});
				}else{
					if(!data||data.length==0)
						return;
					var max = max==0?data.length:limitNumberOfItems(data.length);
					var rows=[];
					var total=data.length;
					for (var i=0; i < max; i++) {
						rows.push(data[i].data);
					}
					var gridData={page:config.page,total:total,rows:rows};
					list.flexAddData(gridData);
					listItems=list[0].grid.getListItems();
					listItems.each(function(i,item){
						$.data(item, "ac_data", data[i]);
					});
				}
				break;
			default:
				if(!data||data.length==0)
					return;
				var max = limitNumberOfItems(data.length);
				for (var i=0; i < max; i++) {
					if (!data[i])
						continue;
					var formatted = options.formatItem(data[i].data, i+1, max, data[i].value, term);
					if ( formatted === false )
						continue;
					var li = $("<li/>").html( options.highlight(formatted, term) ).addClass(i%2 == 0 ? "ac_even" : "ac_odd").appendTo(list)[0];
					$.data(li, "ac_data", data[i]);
				}
				listItems = list.find("li");
				break;
			}
			if ( options.selectFirst ) {
				listItems.slice(0, 1).addClass(CLASSES.ACTIVE);
				active = 0;
			}
			// apply bgiframe if available
			if ( $.fn.bgiframe )
				list.bgiframe();
		}
		
		return {
			init:function(){
				init();
			},
			reloadGrid:function(option,onloadGridResult){
				reloadGrid(option,onloadGridResult);
			},
			gridSettingOptions:function(options){
				gridSettingOptions(options);
			},
			display: function(d, q) {
				init();
				data = d;
				term = q;
				fillList();
			},
			next: function() {
				moveSelect(1);
			},
			prev: function() {
				moveSelect(-1);
			},
			pageUp: function() {
				var max = limitNumberOfItems(data.length);
				if (active != 0 && active - max < 0) {
					moveSelect( -max );
				} else {
					moveSelect(-max);
				}
			},
			pageDown: function() {
				var max = limitNumberOfItems(data.length);
				if (active != listItems.size() - 1 && active + max > listItems.size()) {
					moveSelect( listItems.size() - 1 - active );
				} else {
					moveSelect(max);
				}
			},
			hide: function() {
				element && element.hide();
				listItems && listItems.removeClass(CLASSES.ACTIVE);
				active = -1;
			},
			visible : function() {
				return element && element.is(":visible");
			},
			current: function() {
				return this.visible() && (listItems.filter("." + CLASSES.ACTIVE)[0] || options.selectFirst && listItems[0]);
			},
			show: function() {
				var offset = $(input).offset();
				element.css({
					width: typeof options.width == "string" || options.width > 0 ? options.width : $(input).width(),
					top: offset.top + input.offsetHeight,
					left: offset.left
				}).show();
	            if(options.scroll) {
	                list.scrollTop(0);
	                if(options.component.type=='grid'){  // for type grid
	                	var w=options.width > 0 ? options.width : $(input).width();
	                	var h=options.scrollHeight;
	                	list.css({height: h,overflow: 'auto'});
	                	list.flexResize(w,h);
	                }else{
	                	list.css({
	                		maxHeight: options.scrollHeight,
	                		overflow: 'auto'
	                	});
	                }
	                if($.browser.msie && typeof document.body.style.height === "undefined") {
						var listHeight = 0;
						listItems.each(function() {
							listHeight += this.offsetHeight;
						});
						var scrollbarsVisible = listHeight > options.scrollHeight;
	                    list.css('height', scrollbarsVisible ? options.scrollHeight : listHeight );
						if (!scrollbarsVisible) {
							// IE doesn't recalculate width when scrollbar disappears
							listItems.width( list.width() - parseInt(listItems.css("padding-left")) - parseInt(listItems.css("padding-right")) );
						}
	                }
	            }
			},
			selected: function() {
				var selected = listItems && listItems.filter("." + CLASSES.ACTIVE).removeClass(CLASSES.ACTIVE);
				return selected && selected.length && $.data(selected[0], "ac_data");
			},
			emptyList: function (){
				list && list.empty();
				if(options.component.type=='grid'){
					var gridData={page:1,total:0,rows:[]};
					list.flexAddData(gridData);
				}
			},
			unbind: function() {
				element && element.remove();
			}
		};
	};

	$.fn.selection = function(start, end) {
		if (start !== undefined) {
			return this.each(function() {
				if( this.createTextRange ){
					var selRange = this.createTextRange();
					if (end === undefined || start == end) {
						selRange.move("character", start);
						selRange.select();
					} else {
						selRange.collapse(true);
						selRange.moveStart("character", start);
						selRange.moveEnd("character", end);
						selRange.select();
					}
				} else if( this.setSelectionRange ){
					this.setSelectionRange(start, end);
				} else if( this.selectionStart ){
					this.selectionStart = start;
					this.selectionEnd = end;
				}
			});
		}
		var field = this[0];
		if ( field.createTextRange ) {
			var range = document.selection.createRange(),
				orig = field.value,
				teststring = "<->",
				textLength = range.text.length;
			range.text = teststring;
			var caretAt = field.value.indexOf(teststring);
			field.value = orig;
			this.selection(caretAt, caretAt + textLength);
			return {
				start: caretAt,
				end: caretAt + textLength
			}
		} else if( field.selectionStart !== undefined ){
			return {
				start: field.selectionStart,
				end: field.selectionEnd
			}
		}
	};
})(jQuery);